“We’ve seen him dozens of times before, saying any damn thing that comes into his head (because living on the planet for 70 or 80 years has given him the right to do so). He’s on his own incorrigible wavelength, dropping putdowns as fresh as his body is old, spicing every cranky comment with a perfectly chosen F–bomb.

“He’s also part of the family, of course. He’s the grumpy old man, the naughty codger from hell — the hilarious over-the-hill a–hole who is always played by someone like, you know, Alan Arkin. Just about every time we see him, he’s a showbiz creation, a character baptized in shtick.

“But in Boundaries, a touching yet wised-up father-daughter road movie that’s the best version of this sort of film you could imagine (it’s standard, but very tastefully done), Christopher Plummer plays him with a lived-in, soft-shoe command.

“At 88, Plummer looks about as handsome as a man his age can be, with cheekbones that take the light beautifully, his white hair swept back and set off by a beard that’s still, from certain angles, sort of sexy. He plays Jack Jaconi, the pathologically charming and selfish father of Laura (Vera Farmiga), and by the end of the opening scene, when she’s sounding off to her therapist about him, we’re certain that he must be some version of the monster she describes. Laura won’t even take his calls — that’s how much damage he’s caused.

“Then Jack shows up, and he’s such a smiley and debonair old coot that he doesn’t only seem not so bad; he seems real. True, the tropes are all in place. Jack, who has just gotten kicked out of his senior-citizen facility, has $200,000 worth of marijuana he’s trying to unload. (Yes, he’s a drug dealer.) He also speaks his mind with such a sly-boots sense of humor that it takes us a moment or two to notice how merciless he is. When his teenage grandson, Henry (Lewis McDougall), makes a mild off-color remark about not wanting to go into a shed for fear of being molested, Jack says, “You wouldn’t get molested with a bow in your hair.” Ouch! (On several levels.)

“Yet with no insult to Arkin or the cast of either version of Going in Style, Plummer takes the character of Jack and divests him of any hint of the usual calculated comic overstatement. Every line feels spontaneous, served up with Plummer’s dryly amused finesse, in tones that are quiet yet sonorous enough to rival Morgan Freeman’s.”